I'm sorry, I forgot to mention this a moment ago:
joker_josue
When we wait for the mixing to be done, in step 4 "In progress", there could be a sound signal each time the process moves to the next mixing phase (with the user being able to deactivate it). This allowed, if the user keeps the browser window open, to always know that a phase of the process has been passed;
✅ It's not possible (without obtaining autoplay authorization from the user) to implement this feature due to browser limitations.
My idea is for the user to be able to choose this option. In other words, you can create this option that is activated/deactivated by the end user in their browser.
Either way, it's not an important resource, and so I understand your point.
5. Editing all texts by native speakers
I didn't ask when I did the review, but are you thinking about implementing Portugues (Portugal)?